| 摘要 |
PROBLEM TO BE SOLVED: To provide an image processor which performs an image processing which comprises proper gradation conversion, etc., without receiving the influence, etc., of the change of a pixel value distribution in the subject part of a contrast image and also which provides an excellent post-processing image. SOLUTION: A representative pixel value extracting means 113 extracts a representative pixel value which indicates a contrast agent area in the object image based on the distribution of the pixel values constituting the object image which is obtained by photographing by radiating a subject where a contrast agent is put-in. An area extracting means 114 extracts an area with the range of the pixel value based on the representative pixel value which is obtained by the extracting means 113 and also extracts an area within a fixed distance from the pixel value range. A feature extracting means 115 extracts featured values to be used for gradation conversion from the peripheral area of the area which is obtained by the area extracting means 114. |
